I used a Laptop to do the labs,
Setting an angle on a servomotor did not do go.

At first it went to 180 degrees, then I typed several degrees points such as 45,90,180. and so on,
from the serial monitor screen I could see the numbers entered, but that's all I was able to see.

the servo did not move. I tested it with a servo sweep test and it worked good.

Labs 1 and 2 was on sending and receiving text and numbers, but lab 3 failed to do that. Why?

It just happen that my Laptop went bad on me, so I did the same test on my desktop computer.
So now Lab 3 will not work because it will not compile the code, and I know for a fact that the code is good.